(19)
(11) EP 0 308 978 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
08.08.1990 Bulletin 1990/32

(43) Date of publication A2:
29.03.1989 Bulletin 1989/13

(21) Application number: 88115743.2

(22) Date of filing: 23.09.1988
(51) International Patent Classification (IPC)4: B41M 5/26
(84) Designated Contracting States:
DE FR GB

(30) Priority: 25.09.1987 JP 241625/87

(71) Applicant: KANZAKI PAPER MANUFACTURING CO., LTD.
Chiyoda-ku, Tokyo-to (JP)

(72) Inventors:
  • Okamoto, Tosaku
    Osaka-shi Osaka-fu (JP)
  • Okimoto, Tomoyuki
    Nishinomiya-shi Hyogo-ken (JP)
  • Ishida, Katsuhiko
    Takatsuki-shi Osaka-fu (JP)

(74) Representative: Barz, Peter, Dr. et al
Patentanwälte Dr. V. Schmied-Kowarzik Dipl.-Ing. G. Dannenberg Dr. P. Weinhold Dr. D. Gudel Dipl.-Ing. S. Schubert Dr. P. Barz Siegfriedstrasse 8
80803 München
80803 München (DE)


(56) References cited: : 
   
       


    (54) Multi-color heat sensitive recording material


    (57) In a multi-color heat sensitive recording material comprising a substrate and two or more heat sensitive color-forming layers thereon capable of forming different colors from each other, at least one of the heat sensitive color-forming layers containing a leuco dye and an acidic substance, the recording material characterized in that at least one piperidine derivative represented by the formula [I]

    wherein R₁ is C1∼30 aliphatic group residue which may have C2∼20 alkoxycarbonyl group, or C1∼30 aliphatic group residue which has ether linkage and oxycarbonyl group ; R₂, R₃, R₄, R₅ and X are each methyl group or hydrogen atom ; and ℓ is an integer of 1 to 6, is incorporated at the position where a decolorizing function can be effected against the color-forming system comprising a leuco dye and an acidic substance.





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